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Zogroscope

Description

This device, also known as an optical diagonal machine or cosmorama, was designed for magnifying prints so they could be seen more easily. It has a convex lens mounted in a square wooden frame that, in turn, is supported on a pedestal. A second frame, hinged at the top, holds a mirror that can be held out at any desired angle. Zograscopes came into use in the eighteenth century and remained popular throughout the nineteenth century.

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